What is CVE-2026-57857?

CVE-2026-57857 is a medium-severity vulnerability in Flow Payment, classified under Cross-site Scripting. CVSS score: 4.3/10. Published 2026-07-18.

How severe is CVE-2026-57857?

Medium severity. CVSS v3 base score is 4.3 out of 10.

XSS in Flow Payment

CVE-2026-57857

The Flow Payment plugin for WordPress (flow.cl) version 3.0.8 is vulnerable to reflected cross-site scripting on the WooCommerce checkout page. When the plugin handles an order cancellation, the error_message GET parameter is passed direct…

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.

Affected products

Flow Payment — versions 0, 3.0.9

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

disclosure@vulncheck.com (product)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-57857?: CVE-2026-57857 is a medium-severity vulnerability in Flow Payment, classified under Cross-site Scripting. CVSS score: 4.3/10. Published 2026-07-18.
How severe is CVE-2026-57857?: Medium severity. CVSS v3 base score is 4.3 out of 10.